Quick Reference Guide Spring Fingers Spring fingers (also known as shield fingers, grounding springs or universal ground contacts) are used in almost every small printed circuit board application. A spring finger is a single contact, surface mountable, internal connector. It provides an electrical connection and grounding from EMI noise and static between a PCB and other electronic components, such as a secondary PCB, shield cam, antenna, or speaker. TE Connectivity offers a wide selection of spring fingers in varying styles and sizes depending on the type of application. FEATURES Used for grounding between device and PCB * Provides shielding from vibration from motors, anten- nas, speakers and microphones e Used as a connection for stacking applications between primary and secondary PCBs Available in effective heights of 0.3mm - 6.5mm Requires limited space ona PCB Accommodates soldering and pick-and-place using standard equipment te.com/products/Spring-Fingers BENEFITS Prevents EMI noise and static Provides a highly reliable connection Provides an easy and inexpensive method for connecting multiple PCBs e Allows for versatility in design of the PCB Can be designed in at the last minute No expensive specialized equipment needed APPLICATIONS Cell phones, smart phones MP3 players Digital cameras, camcorders GPS units eReaders Tablets PCs and laptops Home electronic devices Automotive Industrial equipment connectivityTE Connectivity Spring Fingers Applications Mobile Devices @ Digital cameras and videos B Handheld games m@ Payment terminals Hi Cell phones HB Smart phones B MP3 players mM GPS M@ eReaders Home Entertainment H Set top boxes Hi Game consoles @ DVD players @ Blu-Ray disc drives Industrial Equipment @ Security systems @ POS scanners . Personal Computing BH Desktop computers H Notebooks B Tablets H Netbooks = 7E te.com/products/Spring-Fingers connectivityTE Connectivity Spring Fingers Types of Spring Fingers Standard-flat contact Pre-Loaded-Round or Flat Contact Pre-loaded spring fingers are recommended when a stable electrical contact with minimal deflection is needed. The force change is minimized over working range of the spring finger. Standard Box or C type spring fingers both have simple geometry for easy application. Box Ultra low profile Pre-loaded Scalable The scalable family of spring fingers offers the same benefits as pre-loaded spring fingers, but with a common footprint. Ultra low profile, Y type spring fingers, are used in applications where low effective heights are needed. Y Scalable Spring Finger Key Features Spring finger family with a common footprint in scalable heights. a a Locking for prevention of overstretching due to sideways force Dimple on the contact to enhance the contact force Pick-and-place area for 0.75mm nozzle pre-load function Contact can deflect to the bottom of spring finger without permanent deformation Holes provide increased soldering strength and reduce solder wicking Tip bent backwards to prevent hooking @ Radius on both sides of tip to remove sharp edges TE te.com/products/Spring-Fingers connectivityTE Connectivity Spring Fingers Standard and Ultra Low Profile Spring Fingers Y 1447009-5 ~~ Nickel 0.8 2.0 1447009-9 Gold over ~~ Nickel 08 2.0 1447360-9 Gold over ~ Nickel Ld 15 1447360-8 Gold over =~ Nickel 13 12 1746136-1 Gold over 3 Box Nickel 1.5 2.0 1871059-1 Gold over ~ Nickel 7 15 1674954-1 Gold QD Box a 2.0 2.0 1734300-1 ~ Gold over Nickel 3.0 2.49 1734305-1 Tin-Copper ~ over Nickel 25 2.0 1447009-7 > Gold over Nickel 3.5 2.49 1447009-8 2 Gold over Nickel 3.5 2.49 1734303-1 Tin-Copper & Box over Nickel 4.0 2.49 1720028-2 Tin-Copper 0 Box over Nickel 4.0 2.49 1437259-6 SS Nickel 4.0 2.49 1775073-1 Gold over RB Nickel 43 4.0 1717222-1 Gold over Nickel 4.15 3.0 te.com/products/Spring-Fingers TE connectivityTE Connectivity Spring Fingers Pre-Loaded Spring Uncom- Working Range P/N Type eontacy pressed Height | Width Finish (mm /2s 2 R on nmtnonaaonanmtnhonanaa (mm) COCO dO fF FP ee ete ee et PHP ANN NNN NNN 1551631-4 Pre-Loaded Gold over 1.24 1.0 Nickel 1565158-1 Pre-Loaded Gold over 1S W Nickel 1554825-1 Li Pre-Loaded ec 13 10 a 1-1447360-1 Pre-Loaded Gold over 14 10 Nickel . . 1857724-4 1 Pre-Loaded Gold Flash 18 10 over Nickel 1551281-4 a Pre-Loaded ck 18 10 > icke 1551401-4 ie Pre-Loaded ere 1.8 1.0 e 1565322-1 ere] Gold over 16 0.8 Nickel 2040761-1 Gold over Pre-Loaded Nickel 1.99 2.0 v = ou ua aS = a Gold over & Pre-Loaded Nickel 2.0 11 & Pre-Loaded Nickel 2.4 11 Ss RK o a h 4 1827625-1 rea mor tet Gold over 3.0 14 Nickel 1903646-1 Gold over Pre-Loaded Nickel 3.0 1.4 Scalable Spring Finger Family Uncom- Working Range Contact pressed Height Width inis (mm) mm|2522enranrzsenenee2e5 1551572-4 Pre-Loaded Gold over 1.80 115 Nickel 1551573-4 Gold over i Pre-Loaded Nickel 2.15 1.15 1551574-4 Gold over tS Pre-Loaded Nickel 2.60 115 1551575-4 Pre-Loaded Gold Flash 3.00 1.3 over Nickel 1551576-4 Pre-Loaded Gold over 3.40 14 Nickel = TE te.com/products/Spring-Fingers connectivityFrequently asked questions Question1 Why would | use a pre-loaded spring finger in an application? Answer! A pre-loaded spring finger allows you to get the same amount of force, but with a smaller compression. A pre-loaded spring finger provides a stable electrical contact with minimal deflection. Sometimes these are preferred when there is limited height available in an application. Question2 What style of spring finger is best for my application? Answer2 Spring fingers are typically one of the last pieces added to a board. The type to be used is dependent upon the height and space left on the board. The decision of what type of spring finger to use is typically based on personal preference. Question3 Can the types of spring fingers be mixed in an application? Answer3 Yes, an application can have multiple spring fingers and more than one type. For example, there can be simple C types used for grounding between the device and the PCB and then multiple pre-loaded spring fingers on the board for shielding or other simple connections. FOR MORE INFORMATION TE Connectivity Technical Support Center Internet: te.com/help USA: +1 (800) 522-6752 Canada: +1 (905) 475-6222 Mexico: +52 (0) 55-1106-0800 Latin/South America: +54 (O) 11-4733-2200 Germany: +49 (0) 6251-133-1999 UK: +44 (0) 800-267666 France: +33 (O) 1-3420-8686 Netherlands: +31 (0) 73-6246-999 China: +86 (0) 400-820-6015 For other country number go to te.com/supportcenter Part numbers in this brochure are ROHS Compliant*, unless marked otherwise. *as defined www.te.com/leadfree te.com 2011 Tyco Electronics Corporation, a TE Connectivity Ltd. Company. All Rights Reserved. 6-1773460-8 CIS PDF 06/2011 Blu-ray is a trademark of the Blu-ray Disc. Association. TE Connectivity, TE connectivity (logo) and TE (logo) are trademarks. Other logos, product and/or Company names might be trademarks of their respective owners. While TE has made every reasonable effort to ensure the accuracy of the information in this brochure, TE does not guarantee that it is error-free, nor does TE make any other representation, warranty or guarantee that the information is accurate, correct, reliable or current. TE reserves the right to make any adjustments to the inf ormation contained herein at any time without notice. TE expressly disclaims all implied warranties regarding the information contained herein, including, but not limited to, any implied warranties of merchantability or fitness for a particular purpose. The dimensions in this catalog are for reference purposes only and are subject to change without notice. Specifications are subject to change without notice. Consult TE for the latest dimensions and design specifications. connectivity